Flask Framework Cookbook - Second Edition

How to do it...

We will maintain a set in Redis, which will store the products visited recently. This will be populated whenever we visit a product. The entry will expire in 10 minutes. This change goes in views.py:

from my_app import redis 
 
@catalog.route('/product/<id>') 
def product(id): 
    product = Product.query.get_or_404(id) 
    product_key = 'product-%s' % product.id 
    redis.set(product_key, product.name) 
    redis.expire(product_key, 600) 
    return 'Product - %s, $%s' % (product.name, product.price) 

It is good practice to fetch the expire time, that is, 600, from a configuration value. This can be set on the application object in my_app/__init__.py, and can then be fetched from there.

In the preceding method, note the set() and expire() methods on ...